docs: update contributing/pull_request.md

Author: kenjis

contributing/pull_request.md

@@ -2,25 +2,23 @@
 
 ## Contributions
 
-We expect all contributions to
-- conform to our [style guide](./styleguide.md),
-- be commented (inside the PHP source files),
-- be documented (in the [user guide](https://codeigniter4.github.io/userguide/)),
-- and unit tested (in the [test folder](https://github.com/codeigniter4/CodeIgniter4/tree/develop/tests)).
+We expect the following in all pull requests.
+- All git commits are [GPG-signed](#signing)
+- Must follow our [style guide](#php-style)
+- Be [commented](#comments) in the PHP source file
+- Be documented in the [user guide](#user-guide)
+- Be [unit tested](#unit-testing)
+- Pass all checks in GitHub Actions
 
 > [!IMPORTANT]
 > We expect all code changes or bug-fixes to be accompanied by one or more tests
 > added to our test suite to prove the code works.
 
-If pull requests are not accompanied by relevant tests, they will likely be closed.
+If pull requests do not comply with the above, they will likely be closed.
 Since we are a team of volunteers, we don't have any more time to work on the
 framework than you do. Please make it as painless for your contributions to be
 included as possible.
 
-If you need help with getting tests running on your local machines, ask for help
-on the [forum](https://forum.codeigniter.com/forumdisplay.php?fid=27). We would
-be happy to help out.
-
 The [Open Source Guide](https://opensource.guide/) is a good first read for those
 new to contributing to open source!
 
@@ -67,13 +65,18 @@ composer cs
 
 If you are not familiar with Unit Testing, see
 [the forum thread](https://forum.codeigniter.com/showthread.php?tid=81830).
+If you need help with getting tests running on your local machines, ask for help
+on the [forum](https://forum.codeigniter.com/forumdisplay.php?fid=27). We would
+be happy to help out.
 
 Unit testing is expected for all CodeIgniter components. We use PHPUnit,
 and run unit tests using GitHub Actions for each PR submitted or changed.
 
-In the CodeIgniter project, there is a `tests` folder, with a structure
+In the CodeIgniter project, there is a [tests][tests-folder] folder, with a structure
 that parallels that of `system`.
 
+[tests-folder]: https://github.com/codeigniter4/CodeIgniter4/tree/develop/tests
+
 The normal practice would be to have a unit test class for each of the
 classes in `system`, named appropriately. For instance, the `BananaTest`
 class would test the `Banana` class. There will be occasions when it is